User Manual

Antenna Tuning
July 2008 Revision 4.2 49/62
Figure 33: Antenna Adjustment Screw
The center antenna always remains fixed in position and connected to the antenna-tuning device.
The other two antennas should be slightly loosened so they can be moved with relative ease but
do not move on their own (Figure 33)
The isolation should be checked as follows:
1. Adjust the position of the bottom antenna with respect to the center antenna.
2. Adjust the vertical position of the bottom antenna so that a minimum is seen on the
oscilloscope.
3. Repeat with the top antenna.
While the top antenna is connected to the oscilloscope the bottom antenna should remain
connected to the antenna connection board, and visa versa.
The central antenna remains fixed in position and the top and bottom antennas are moved,
one at a time, to adjust the isolation.
Adjustment screw